This includes all Spam email where the sender address is forged to appear to be from you. The problem is that as soon as you add your own email address or domain name to your spam filtering allow list, all email from these addresses will sail through your spam filters (as requested). The intention is to ensure that no email from other people in their organization (or that they send to themselves) is ever caught in the spam filter by mistake - because no one in their domain is sending spam, right? As spam filters get more and more complicated, people have taken to adding their own email addresses and/or the their domain names to their spam filtering allow lists.
Sending email to you that appears to be from you is an increasingly popular Spamming trick. Why do Spammers send you Spam that appears to be from you? with SPF, DKIM, DMARC, and ARC, recipients (including yourself) can use Spam Filters to determine that these messages were not authorized and can thus discard them as fraudulent.
The best you can do is to use SPF and/or DKIM, technologies that build on these such as DMARC and ARC, or PGP or S/MIME digital signatures to allow your recipients to verify the messages if they want to (though most recipients may not know how to use these technologies). So, while you do own your domain name and can lock down the accounts you are using to send and receive email, there is no way to prevent someone else from sending an email message that purports to be from you or some address at your domain. This is in fact extremely easy to do, and Spammers use this facility with almost every message that they send. Just as you could mail a letter at the post office and write any return address on it, a Spammer can compose and send an email address with any “From” email address and name. The way that email works at a fundamental level, there is very little validation performed on the apparent identity of the “Sender” of an email. How can Spammers use your email address to send Spam? gets a Spam email addressed so it appears to be from We discussed this issue tangentially in a previous posting: Bounce Back & BackScatter Spam – “Who Stole My Email Address”? However, many users wonder how this is even possible, while others are concerned if their Spam filters are not catching these messages. It is surprisingly common for users to receive Spam email messages that appear to come from their own address (i.e.